Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 129-133.doi: 10.12108/yxyqc.20190515

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Influence of ion composition and salinity on recovery of water flooding with low salinity

HUANG Guangqing   

  1. International Logging Company, Great Wall Drilling Company of CNPC, Beijing 100101, China
  • Received:2018-12-05 Revised:2019-04-29 Online:2019-09-21 Published:2019-09-16

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Abstract: The implementation of water flooding with low salinity for EOR has certain requirements for the ion composition of injected water and formation water. Based on the laboratory sandstone core displacement experiment,the effect of ion composition of injected water and formation water on enhanced oil recovery by water flooding with low salinity was studied by contrast method. The results show that the formation water containing divalent cations Ca2+ or Mg2+ can improve oil recovery,and the effect of Ca2+ is better than that of Mg2+. Only when the salinity of injected water is lower than the salinity threshold determined by the oil-water system can the recovery be improved. Final determination of formation water containing bivalent cations Ca2+ or Mg2+,and the salinity of injected water need to be lower than the salinity threshold determined by reservoir oil-water system,is the necessary condition to achieve EOR by water flooding with low salinity.

Key words: water flooding with low-salinity, divalent cation, enhanced oil recovery, salinity threshold

CLC Number: 

  • TE341
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